Hi Not had the Fridge Freezer Long but was my mums for a few years and was perfect.
Ok Freezer is fine CDA539FW has been certified safe by Beko
The Fridge will kick in below a certain temp very low then stay on till it gets nice and cold but wont stay cold untill it gets warm again creating condensation inside plastic containers like clover ect
is this maybe the Thermostat ? nit is the FW model not 1 or 2